The experiments both indoors and outdoors, on the freshly felled logs of the Chinese red pine （Pinus massoniana） with or without bark which are sprayed with chemicals to protect against decay and insect damage show that the better insecticides are Phoxin, Fenthion and Lindane; and the better wood preservatives are 6781, 6782, 6783, 6784, FCAP, AC,3,B etc. All of these preservatives are the water-borne. Being sprayed with 6781, 6782, the debarked pine logs are not degraded after storage outdoors for two years, and the quality of the wood keeps the same as the original.By dry storage indoors, it has the better result for the logs of hardwood （Liquidambar formosana and Alniphyllum fortunei） which are debarked and sprayed with chemicals, and it has the worse result to be stored outdoors.After dipping treatment on the fresh sawn-timber of hardwood （L. f. and A. f.） with 6782 preservative, it gives the better result in preventing mold and decay by dry storage indoors for one year.Rot occurs in all the control wood which degrades seriously and becomes substandard or useless after two years.