diff --git a/.github/workflows b/.github/workflows
new file mode 160000
index 0000000..9208e86
--- /dev/null
+++ b/.github/workflows
@@ -0,0 +1 @@
+Subproject commit 9208e8663ef7707ad74ebf4ea44b1f4e045b25c9
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..85c3f68
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+*.jl.*.cov
+*.jl.cov
+*.jl.mem
+/Manifest.toml
+/deps/build.log
+/docs/build/
+
+/.history
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..92d9e90
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 Hauiming Yu <Huaimingyuuu@gmail.com> and contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/Project.toml b/Project.toml
new file mode 100644
index 0000000..f9bddce
--- /dev/null
+++ b/Project.toml
@@ -0,0 +1,22 @@
+name = "QuanEstimation"
+uuid = "088c8dff-a786-4a66-974c-03d3f6773f87"
+authors = ["Hauiming Yu <Huaimingyuuu@gmail.com> and contributors"]
+version = "0.1.0"
+
+[deps]
+DifferentialEquations = "0c46a032-eb83-5123-abaf-570d42b7fbaa"
+JLD = "4138dd39-2aa7-5051-a626-17a0bb65d9c8"
+LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+SharedArrays = "1a1011a3-84de-559e-8e89-a11a2f7dc383"
+SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
+Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
+
+[compat]
+julia = "1.6.2"
+
+[extras]
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[targets]
+test = ["Test"]
diff --git a/README.md b/README.md
index dc9c6a9..6af71d0 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,6 @@
-# QuanEstimation.jl
\ No newline at end of file
+# QuanEstimation
+
+[![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://HuaimingYuuu.github.io/QuanEstimation.jl/stable)
+[![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://HuaimingYuuu.github.io/QuanEstimation.jl/dev)
+[![Build Status](https://github.com/HuaimingYuuu/QuanEstimation.jl/workflows/CI/badge.svg)](https://github.com/HuaimingYuuu/QuanEstimation.jl/actions)
+[![Coverage](https://codecov.io/gh/HuaimingYuuu/QuanEstimation.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/HuaimingYuuu/QuanEstimation.jl)
diff --git a/docs/Manifest.toml b/docs/Manifest.toml
new file mode 100644
index 0000000..7c574be
--- /dev/null
+++ b/docs/Manifest.toml
@@ -0,0 +1,97 @@
+# This file is machine-generated - editing it directly is not advised
+
+[[ANSIColoredPrinters]]
+git-tree-sha1 = "574baf8110975760d391c710b6341da1afa48d8c"
+uuid = "a4c015fc-c6ff-483c-b24f-f7ea428134e9"
+version = "0.0.1"
+
+[[Base64]]
+uuid = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
+
+[[Dates]]
+deps = ["Printf"]
+uuid = "ade2ca70-3891-5945-98fb-dc099432e06a"
+
+[[DocStringExtensions]]
+deps = ["LibGit2"]
+git-tree-sha1 = "a32185f5428d3986f47c2ab78b1f216d5e6cc96f"
+uuid = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
+version = "0.8.5"
+
+[[Documenter]]
+deps = ["ANSIColoredPrinters", "Base64", "Dates", "DocStringExtensions", "IOCapture", "InteractiveUtils", "JSON", "LibGit2", "Logging", "Markdown", "REPL", "Test", "Unicode"]
+git-tree-sha1 = "350dced36c11f794c6c4da5dc6493ec894e50c16"
+uuid = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
+version = "0.27.5"
+
+[[IOCapture]]
+deps = ["Logging", "Random"]
+git-tree-sha1 = "f7be53659ab06ddc986428d3a9dcc95f6fa6705a"
+uuid = "b5f81e59-6552-4d32-b1f0-c071b021bf89"
+version = "0.2.2"
+
+[[InteractiveUtils]]
+deps = ["Markdown"]
+uuid = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
+
+[[JSON]]
+deps = ["Dates", "Mmap", "Parsers", "Unicode"]
+git-tree-sha1 = "8076680b162ada2a031f707ac7b4953e30667a37"
+uuid = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
+version = "0.21.2"
+
+[[LibGit2]]
+deps = ["Base64", "NetworkOptions", "Printf", "SHA"]
+uuid = "76f85450-5226-5b5a-8eaa-529ad045b433"
+
+[[Logging]]
+uuid = "56ddb016-857b-54e1-b83d-db4d58db5568"
+
+[[Markdown]]
+deps = ["Base64"]
+uuid = "d6f4376e-aef5-505a-96c1-9c027394607a"
+
+[[Mmap]]
+uuid = "a63ad114-7e13-5084-954f-fe012c677804"
+
+[[NetworkOptions]]
+uuid = "ca575930-c2e3-43a9-ace4-1e988b2c1908"
+
+[[Parsers]]
+deps = ["Dates"]
+git-tree-sha1 = "477bf42b4d1496b454c10cce46645bb5b8a0cf2c"
+uuid = "69de0a69-1ddd-5017-9359-2bf0b02dc9f0"
+version = "2.0.2"
+
+[[Printf]]
+deps = ["Unicode"]
+uuid = "de0858da-6303-5e67-8744-51eddeeeb8d7"
+
+[[QuanEstimation]]
+path = ".."
+uuid = "088c8dff-a786-4a66-974c-03d3f6773f87"
+version = "0.1.0"
+
+[[REPL]]
+deps = ["InteractiveUtils", "Markdown", "Sockets", "Unicode"]
+uuid = "3fa0cd96-eef1-5676-8a61-b3b8758bbffb"
+
+[[Random]]
+deps = ["Serialization"]
+uuid = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+
+[[SHA]]
+uuid = "ea8e919c-243c-51af-8825-aaa63cd721ce"
+
+[[Serialization]]
+uuid = "9e88b42a-f829-5b0c-bbe9-9e923198166b"
+
+[[Sockets]]
+uuid = "6462fe0b-24de-5631-8697-dd941f90decc"
+
+[[Test]]
+deps = ["InteractiveUtils", "Logging", "Random", "Serialization"]
+uuid = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[[Unicode]]
+uuid = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
diff --git a/docs/Project.toml b/docs/Project.toml
new file mode 100644
index 0000000..5f54614
--- /dev/null
+++ b/docs/Project.toml
@@ -0,0 +1,3 @@
+[deps]
+Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
+QuanEstimation = "088c8dff-a786-4a66-974c-03d3f6773f87"
diff --git a/docs/make.jl b/docs/make.jl
new file mode 100644
index 0000000..d356f6d
--- /dev/null
+++ b/docs/make.jl
@@ -0,0 +1,23 @@
+using QuanEstimation
+using Documenter
+
+DocMeta.setdocmeta!(QuanEstimation, :DocTestSetup, :(using QuanEstimation); recursive=true)
+
+makedocs(;
+    modules=[QuanEstimation],
+    authors="Hauiming Yu <Huaimingyuuu@gmail.com> and contributors",
+    repo="https://github.com/HuaimingYuuu/QuanEstimation.jl/blob/{commit}{path}#{line}",
+    sitename="QuanEstimation.jl",
+    format=Documenter.HTML(;
+        prettyurls=get(ENV, "CI", "false") == "true",
+        canonical="https://HuaimingYuuu.github.io/QuanEstimation.jl",
+        assets=String[],
+    ),
+    pages=[
+        "Home" => "index.md",
+    ],
+)
+
+deploydocs(;
+    repo="github.com/HuaimingYuuu/QuanEstimation.jl",
+)
diff --git a/docs/src/index.md b/docs/src/index.md
new file mode 100644
index 0000000..7d82778
--- /dev/null
+++ b/docs/src/index.md
@@ -0,0 +1,12 @@
+```@meta
+CurrentModule = QuanEstimation
+```
+
+# QuanEstimation
+
+```@index
+```
+
+```@autodocs
+Modules = [QuanEstimation]
+```
diff --git a/src/QuanEstimation.jl b/src/QuanEstimation.jl
new file mode 100644
index 0000000..bca0012
--- /dev/null
+++ b/src/QuanEstimation.jl
@@ -0,0 +1,3 @@
+module QuanEstimation
+
+end
\ No newline at end of file
diff --git a/src/opt_target.jl b/src/opt_target.jl
new file mode 100644
index 0000000..f7a5864
--- /dev/null
+++ b/src/opt_target.jl
@@ -0,0 +1,20 @@
+abstract type AbstractOpt end
+
+struct Opt <: AbstractOpt
+    opt_target::Symbol
+end
+
+struct ControlOpt<:Opt end
+struct StateOpt<:Opt  end
+struct MeasurementOpt<:Opt end
+struct CompOpt<:Opt end
+struct StateControlOpt<:CompOpt end
+struct StateMeasurementOpt<:CompOpt end
+struct StateControlMeasurementOpt<:CompOpt end
+
+ControlOpt() = ControlOpt(:Copt)
+StateOpt() = StateOpt(:Sopt)
+MeasurementOpt() = MeasurementOpt(:Mopt)
+StateControlOpt() = StateControlOpt(:SCopt)
+StateMeasurementOpt() = StateMeasurementOpt(:SMopt)
+StateControlMeasurementOpt() = StateControlMeasurementOpt(:SCMOpt)
\ No newline at end of file
diff --git a/src/struct.jl b/src/struct.jl
new file mode 100644
index 0000000..d10af0d
--- /dev/null
+++ b/src/struct.jl
@@ -0,0 +1,12 @@
+abstract type AbstractSystem end
+
+mutable struct QuanEstSystem{T<:AbstractOpt, F<:AbstractObjective, A<:AbstractAlogrithm, D<:AbstractDynamics, O<:AbstractOutput} <:AbstractSystem
+    opt::T
+    objective::F
+    algorithm::A
+    dynamics::D
+    output::O
+end
+
+
+
diff --git a/test/runtests.jl b/test/runtests.jl
new file mode 100644
index 0000000..d251e80
--- /dev/null
+++ b/test/runtests.jl
@@ -0,0 +1,6 @@
+using QuanEstimation
+using Test
+
+@testset "QuanEstimation.jl" begin
+    # Write your tests here.
+end