How to get to Shangrao from Kunming, which is the best and convenient way to travel by air or train?

There are three train between the two places, K80, K740 and L1218, but all the train will take about 27 to 36 hours on the way. If you can buy the soft sleeper, you can choose to use this method.
Or you can fly to Nanchang from KM and take bullet trains for SR. The bullet trains take about two hours.