flame comes up for less than 1 minutes and go down right away

What was the original issue with your dryer? Not heating/ drying clothes? This is normal for the flame to cycle on and off. IT will do this through the whole cycle to maintain proper temp. 60 seconds is a good cycle time for the flame. If it was only staying on for a few seconds before turning off it would be a sign that the air flow is restricted. If you are getting heat in the beginning of the cycle and stops as the cycles goes on, then this would be a sign of bad gas coils. This is common. The gas coils will work at the beginning of the cycle and then the coils will open and fail until they cool down again. To check to see if your coils are bad you need to let the dryer run until it gets to the failed state. With bad gas coils you will see the igniter come on and then turn off with out a flame or ignition. If you see this, replace your gas coils. I have attached 2 videos to help you and a link to purchase the parts if needed.