user65200: If I have a blockchain.info wallet, I got the 12 words. Can I use these 12 words to restore into a new Electrum wallet? 
After that, will the blockchain wallet still operational? Say, can it still receive funds or spend fund? If fund is received/spent, will it appear in the new Electrum wallet?
On the other hand, if I send fund / receive fund in the new Electrum wallet, will those transaction appear in the blockchain.info wallet?

user38324: In Electrum:

Click File > New/Restore, enter a name and click Next.
Select Standard Wallet and then Next. 
Select I already have a seed and then Next.
Enter the 12 words seed you got from blockchain.info (from Settings > Security > Backup phrase.
Click the "Options" button and enable BIP39.
Accept the default derivation key and click Next.
In the next step, set a wallet password and enable encryption.

Now you have your wallet imported.

if I send fund / receive fund in the new Electrum wallet, will those transaction appear in the blockchain.info wallet?

Yes, they will.

65200: <p>If I have a blockchain.info wallet, I got the 12 words. Can I use these 12 words to restore into a new Electrum wallet? </p>

<p>After that, will the blockchain wallet still operational? Say, can it still receive funds or spend fund? If fund is received/spent, will it appear in the new Electrum wallet?</p>

<p>On the other hand, if I send fund / receive fund in the new Electrum wallet, will those transaction appear in the blockchain.info wallet?</p>
 38324: <p>In Electrum:</p>

<ol>
<li>Click <strong>File</strong> > <strong>New/Restore</strong>, enter a name and click <strong>Next</strong>.</li>
<li>Select <strong>Standard Wallet</strong> and then <strong>Next</strong>. </li>
<li>Select <strong>I already have a seed</strong> and then <strong>Next</strong>.</li>
<li>Enter the 12 words seed you got from blockchain.info (from <em>Settings</em> > <em>Security</em> > <em>Backup phrase</em>.</li>
<li>Click the "Options" button and enable BIP39.</li>
<li>Accept the default derivation key and click <strong>Next</strong>.</li>
<li>In the next step, set a wallet password and enable encryption.</li>
</ol>

<p>Now you have your wallet imported.</p>

<blockquote>
  <p>if I send fund / receive fund in the new Electrum wallet, will those transaction appear in the blockchain.info wallet?</p>
</blockquote>

<p>Yes, they will.</p>
