Investment refers to the specific economic subject in order to reap the benefits in the foreseeable future period or capital appreciation, within a certain period of a certain subject matter in the field of putting enough amount of money or currency equivalent physical economic behavior. It can be divided into physical investment, capital investment and securities investment. The former is to put money into the enterprise, make a certain profit through production and operation. The latter is to purchase the shares and corporate bonds issued by the enterprise and indirectly participate in the profit distribution of the enterprises. Securities investment analysis method mainly has the following three: analysis of fundamental analysis, technical analysis, evolution, in which the fundamental analysis is mainly used in the choice of investment subject matter, technical analysis and evolution analysis is mainly used in the specific investment operation on the judgment of time and space, as a useful supplement to improve effectiveness and reliability of investment analysis. High compression ratio if choose low grades of gasoline engine, can make the cylinder temperature rises, the incomplete combustion of gasoline, strong vibration machine, so that the output power down, damage to the parts, fuel consumption and driving. If lower compression ratio engine with high grade oil, can appear "delay" phenomenon, namely the compression ratio is less than the highest point of spontaneous combustion, as will appear incomplete combustion phenomenon, the engine is no good.