The coherent effect inherent in particle-particle pair or particle-hole pair which is moving in a rotating weak-deformed nuclear field has been investigated. The low-lying even-parity states 0+, 2+, 4+, of O18 and odd-parity states 0-, 1-, 2-, 3-, of O16 have been calculated accordingly. Comparison with the corresponding wave-functions by the shell model classical calculation shows that there is much similarity between them. Some preliminary conclusions are obtained as follows: The main components in nuclear force are the P2 force plus certain other force with coherent property. The former is equivalent to a rotating deformed field, while the latter is essential in all calculated states except for the 0- state only.
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