After years of research, scientist Einstein got an equation, from which he got the position of black holes, and then put forward the existence of black holes in general relativity. It is obtained through the distortion of time and space. Einstein didn't predict black holes, but Einstein's equation included the location of black holes. Schwarzschild, a German scientist, got a solution when he calculated with Einstein's equation. If a large amount of matter gathers at a point in space, it will form a strong gravity, and its escape speed will exceed the speed of light. This is a black hole. Humans have endless yearning and doubts about the vast universe, and there will always be new discoveries and puzzles in long-term observation and thinking. 1 19 15 years, Einstein delivered a series of speeches on general relativity, claiming that space and time are a continuum and can be distorted by anything with quality. The result of distortion is gravity, that is, gravity is the result of space-time distortion, forcing everything, from light to planets, even apples falling from trees, to pass through space along a curved path. After Einstein put forward the special theory of relativity in February1905, he began to study the combination of gravitational field and special theory of relativity, so there was the general theory of relativity in which the gravitational field was distorted by time and space. The field equation of general relativity has a Schwarzschild solution, which predicts the existence of black holes. It is said that Einstein once had a big headache for this solution. The field equation can well explain all phenomena caused by gravity. When the mass of a sphere reaches its limit, even light cannot escape. This is a black hole. Because the basis of general relativity is that the speed of light in vacuum is constant. The essence of gravity is the distortion of time and space caused by mass. A black hole cannot be observed directly, but its existence and mass can be indirectly known, and its influence on other things can be observed. Temporal and spatial variation of black holes: At the beginning of galaxy material being sucked into black holes by strong gravity, the regional time variation is zero, and at the speed of light, the time variation at the exit of white holes is zero. Generally speaking, the existence of a black hole is the position calculated by Einstein through the equation obtained by research. Through the study of general relativity, the conclusion that a black hole exists is drawn.