According to the ingredients and contents of negtive ions. the fourteen geothermal water springs in Jiaodong area are mainly classfied into types Ⅰ 1、 Ⅰ2、 Ⅱ 1、 Ⅱ 2 and Ⅲ .
If succeed in resolving such issues as leakage, cycling passage and surface of heat exchange in building underground boiler, utilizing geothermal energy to extract marine gas hydrates will possibly be a good choice for commercial production in the future.