The main reasons for the non-merger of Shang Jie and Xingyang are as follows:

1. Shang Jie District itself is an "enclave", separated from Zhengzhou City by Xingyang City, and the construction of the block was determined by the social and economic conditions at that time.

2. After the reform of Xingyang City, it is of little significance for Shang Jie District to exist alone. It can be merged into one district, or even divided into two districts in the future, but it is definitely not the current zoning pattern.

3. Merger or other adjustments are conducive to optimizing the allocation of resources and improving the spatial layout effect.

In a word, there are many reasons why Shang Jie and Xingyang did not merge, including historical, economic and demographic factors. Whether it will merge in the future needs further study and discussion.