I have an rc dronre in which i have used cc3d flight controller and fs-ct6b transmitter but it is not working cc3d controller is not responding when transmitter is on

Hello Mayank. Welcome to this wonderful forum.
Your problem is not clear in explaining how you have connected flysky receiver with CC3D flight controller.
What do you mean by not responding? What are you expecting to happen when transmitter is switched ON?

Are you using any configurator/GUI like betaflight or cleanflight etc to check the input signal?

When the transmitter is on then the motors should move but the motors are not moving and when i conect esc directly to the reciever then the motors are working

Quote from: Mayank VEER SINGH on April 06, 2019, 06:51:53 PM
When the transmitter is on then the motors should move but the motors are not moving and when i conect esc directly to the reciever then the motors are working

This answer of yours does not answer all my questions.
However what I can say is before motors start you need to ARM the flight controller. Are you doing it correctly? Generally there will be three leds on flight controller.
1. Indicates power to flight controller. -- mostly red.
2. Indicates receiver input is available(mostly available in latest flight controllers cannot tell in your case).
3. Indicates if the flight controller is ARMED or not.

What all do you notice and at what sequence do you see them?
**NOTE: Remove propellers when testing**