The theory of modern political economy in China holds that the profit under the socialist system is the form of the value of the surplus products created by the workers for the society. The value composition of the product is c+v+m,c+v is converted into production cost, and the m is part of the surplus product created by the laborer for the society, which translates into profit for the enterprise. The specific form of socialist profit is: to realize profit, that is, the balance of the sales revenue of the enterprise minus the expenses of various expenses; To pay the profits in accordance with the provisions to the national financial department; After tax profit, that is, the profit of the enterprise shall be returned to the enterprise in accordance with the state provisions. Securities investment refers to investors (as a legal person or natural person) to buy shares, bonds, funds, securities, and securities derivatives, in order to get dividends, interest, and capital gains investment behavior and investment process, is an important form of indirect investment. [1] Microsoft's Surface Pro, Surface Laptop, Surface Book and Surface Studio are the main products of Microsoft's Surface series, but there is a clear difference in the share of the devices. The Surface Pro products account for the highest share (79.9%), the Surface Book (7.5%), Surface Laptop (2.0%), and Surface Studio (0.2%). Interest determines the regularity of prescriptive (interest this qualitative rules will determine the amount of the rules), the amount of interest depends on profit, interest rate depends on the average profit margin. Marx further pointed out that, between average profit margin and zero, interest rate depends on two factors: one is profit margin; The second is the proportion of total profits allocated between lenders and borrowers. 3. Modern enterprise period