Coating treatment method, non-transitory computer storage medium and coating treatment apparatus

A non-transitory computer readable storage medium storing a computer program operating on a computer at a control unit controlling a coating treatment apparatus to execute a coating treatment method at the coating treatment apparatus,

• wherein the coating treatment method includes:
• a first step of rotating a substrate at a first rotation number;
• a second step of subsequently decelerating the rotation of the substrate, and rotating the substrate at a second rotation number which is slower than the first rotation number, before the coating solution diffuses to an end of the substrate;
• a third step of subsequently accelerating the rotation of the substrate, and rotating the substrate at a third rotation number which is faster than the second rotation number and slower than the first rotation number;
• a fourth step of subsequently decelerating the rotation of the substrate, and rotating the substrate at a fourth rotation number which is slower than the third rotation number to diffuse the coating solution at a central portion of the substrate toward an outer periphery of the substrate while suppressing drying of the coating solution on the substrate;
• a fifth step of subsequently accelerating the rotation of the substrate, and rotating the substrate at a fifth rotation number which is faster than the fourth rotation number,
• wherein a supply of a coating solution to a central portion of the substrate is continuously performed from the first step to a middle of the second step or during the first step, and the fourth rotation number is more than “0” (zero) rpm and 500 rpm or less;
• and
• a seventh step of rotating the substrate at an eighth rotation number which is slower than the first rotation number and faster than the second rotation number between said first step and said second step,
• wherein the eighth rotation number is 1500 m to 2000 rpm.