user57976: 
Hi I am using Arduino uno & ESP-01 
ESP-01 is working well when I put firmware to ESP, for example, wifi spreading or AT command is okay.
but when I disconnect arduino from PC(disconnect USB connection)
ESP-01 suddenly do not work anything. no spread wifi, no AT command reaction..
so I always have to re-input the firmware to ESP again, for make it work again.
How can I make maintain ESP-01 's firmware?
picture is my connection status. thank you

user37622: You have io 0 puled LOW so the esp-01 firmware starts in flashing mode and the firmware starts immediately after flashing (no reset). 
Remove io 0 to ground connection and add a pull-up for io 0 over a 10kOhm resistor if you want the esp-01 to start normally.
Note: powering the esp-01 from the 3.3 V pin of Uno (150mA max) could be insufficient for esp8266 WiFi operations at top transmit power (according to specs it can draw to 170 mA).

57976: <p><a href="https://i.stack.imgur.com/2AbW5.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2AbW5.jpg" alt="enter image description here"></a></p>

<p>Hi I am using Arduino uno &amp; ESP-01 </p>

<p>ESP-01 is working well when I put firmware to ESP, for example, wifi spreading or AT command is okay.</p>

<p>but when I disconnect arduino from PC(disconnect USB connection)</p>

<p>ESP-01 suddenly do not work anything. no spread wifi, no AT command reaction..</p>

<p>so I always have to re-input the firmware to ESP again, for make it work again.</p>

<p>How can I make maintain ESP-01 's firmware?</p>

<p>picture is my connection status. thank you</p>
 37622: <p>You have io 0 puled LOW so the esp-01 firmware starts in flashing mode and the firmware starts immediately after flashing (no reset). </p>

<p>Remove io 0 to ground connection and add a pull-up for io 0 over a 10kOhm resistor if you want the esp-01 to start normally.</p>

<p>Note: powering the esp-01 from the 3.3 V pin of Uno (150mA max) could be insufficient for esp8266 WiFi operations at top transmit power (according to specs it can draw to 170 mA).</p>
