diff --git a/lib/download/npm.js b/lib/download/npm.js
index 6c6cd1d6..9d9211e8 100644
--- a/lib/download/npm.js
+++ b/lib/download/npm.js
@@ -484,6 +484,7 @@ async function getTarballStream(tarballUrl, pkg, options) {
         stream.on('data', chunk => {
           options.totalTarballSize += chunk.length;
         });
+        stream.tarballUrl = tarballUrl;
         return stream;
       }
     } catch (err) {
@@ -512,6 +513,7 @@ async function getTarballStream(tarballUrl, pkg, options) {
     result.res.on('data', chunk => {
       options.totalTarballSize += chunk.length;
     });
+    result.res.tarballUrl = tarballUrl;
     return result.res;
   }
 
@@ -590,6 +592,7 @@ async function getTarballStream(tarballUrl, pkg, options) {
 
   const stream = fs.createReadStream(tarballFile);
   stream.tarballFile = tarballFile;
+  stream.tarballUrl = tarballUrl;
   return stream;
 }
 
@@ -698,6 +701,7 @@ function checkShasumAndUngzip(ungzipDir, readstream, pkg, useTarFormat, options)
   return new Promise((resolve, reject) => {
     const shasum = pkg.dist.shasum;
     const hash = crypto.createHash('sha1');
+    let tarballSize = 0;
     const opts = {
       cwd: ungzipDir,
       strip: 1,
@@ -760,12 +764,15 @@ function checkShasumAndUngzip(ungzipDir, readstream, pkg, useTarFormat, options)
       resolve();
     }
 
-    readstream.on('data', buf => hash.update(buf));
+    readstream.on('data', buf => {
+      tarballSize += buf.length;
+      hash.update(buf);
+    });
     readstream.on('end', () => {
       // this will be fire before extracter `env` event fire.
       const realShasum = hash.digest('hex');
       if (realShasum !== shasum) {
-        const err = new Error(`real sha1:${realShasum} not equal to remote:${shasum}`);
+        const err = new Error(`real sha1:${realShasum} not equal to remote:${shasum}, download url ${readstream.tarballUrl || ''}, download size ${tarballSize}`);
         err.name = 'ShasumNotMatchError';
         handleCallback(err);
       }
diff --git a/test/download.test.js b/test/download.test.js
index 7875f3ad..46ab78f4 100644
--- a/test/download.test.js
+++ b/test/download.test.js
@@ -90,7 +90,8 @@ describe('test/download.test.js', () => {
         throw new Error('should not run this');
       } catch (err) {
         assert(err.name === 'ShasumNotMatchError');
-        assert(/real sha1:7f5098d60307b4ef7240c3d693cb20a9473c6074 not equal to remote:00098d60307b4ef7240c3d693cb20a9473c111/.test(err.message));
+        assert(/real sha1:7f5098d60307b4ef7240c3d693cb20a9473c6074 not equal to remote:00098d60307b4ef7240c3d693cb20a9473c111, download url https:\/\/registry.npmmirror.com\/pedding\/-\/pedding-1.0.0.tgz, download size 2107 \(pedding@1.0.0\)/
+          .test(err.message));
       }
     });