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In the projection gravitation theory, there exists a merging model of black hole formation. Particles that meet the merging condition can be combined together to form a black hole. The essence of a black hole is an empty hole. A black hole is not a single object, it is a composite particles system. From this model, the black hole entropy formula can be easily derived out. This merging condition is equivalent to a temperature condition. From this black hole model, we can easily derive out the Verlinde’s entropy gravity proposal formula and the Unruh formula. It is also proved that the Verlinde’s entropy gravity proposal formula and the Unruh formula are actually equivalent. The Verlinde’s entropy gravity proposal theory is not universally correct, but only in special circumstances. The gravitational acceleration produced by an object has a maximum value. Projection gravitation theory has important research value.

Black Hole Entropy, Verlinde’s Entropy Gravity Proposal and Unruh Formula in Projection Gravitation