Is 1hr 30mins enough to transfer from Thai Airways to China Eastern Alirlines at Kunming Airport?

First, you need to confirm with the airline company whether the two flights are connected or not, and whether your luggage directly reach to the destination. What's more, whether you need to change the terminal or go through customs, and whether the flight can be on time are all deciding factors. Personally, I feel pressed for one and a half hours for changing flight.