If the balance of the National Natural Science Foundation of China is too large, the following measures can be taken:

1. Return the funds to the Natural Science Foundation of China through the original channels. According to the "Instructions for Preparing the Final Accounts of National Natural Science Foundation of China Projects", if there is still any remaining funds after 2 years, they should be returned to the Natural Science Foundation of China through the original channels.

2. For projects that have not passed the final acceptance and have passed the final acceptance after rectification, or if the credit evaluation of the supporting unit is poor, a description of the situation will be provided and submitted together with the project final account form after approval by the supporting unit. .

The above suggestions are for reference only. Reasonable planning should be based on the specific progress of the project. If you have any questions, it is recommended to consult professionals.