It is of great significance to explore the quantitative evaluation method of forest cultural value, which is an important part of forest values. The studies are carried out for the quantitative assessment method of the forest culture values at the scales of parks and regions using literature review, theoretical analysis, and case verification, and the cultural values of forest nationwide and in different provinces are assessed using this studied method. Forest cultural value can reflect the positive impacts that forests produce on people's health, quality of life, and spiritual development. The assessment method which is called as culture year assessment method and takes man-forest symbiosis time as the core can be adopted to evaluate the forest culture value, with "cultural year" as its unit of measurement. The cultural value of forest park can be reflected by the time visitors spend in it. The cultural value of forests in a region can be measured by the total time of settled people's symbiosis time with forests and the time spent for forest cultural activities. The assessment results show that the cultural values of forest parks in China generally have great room for improvement. There are big differences in forest culture values among different provinces in terms of total value, unit land value, per capita value, and unit forest value. Sichuan, Guangdong, Yunnan, Fujian, and Heilongjiang are the provinces with the highest forest cultural value; Shanghai, Fujian, Zhejiang, Guangdong, and Beijing have a better exploitation of the forest cultural values by unit land; Fujian, Jilin, Yunnan, Heilongjiang, and Sichuan enjoy excellent per capita forest cultural benefits; and Shanghai, Tianjin, Jiangsu, Beijing, and Henan show strong demands for forest cultural value.