The invention discloses a realizing method of an adjustable speed
timer in the Windows operation
system environment. The method comprises that an APIC
timer is selected to provide an
user state interface; the
user state interface is packaged, wherein adjustable-
speed function and
time correlation function interface are packaged to a dynamic linkbase used for application procedures of the Windows
operating system; the application procedures load the dynamic linkbase to realize the call of the
user state interface; the user state interface is called, and the adjusted APIC
timer is inducted to the inner core; the adjusted APIC timer cycle is assigned to an initial counter register to realize cycle adjustment of the APIC timer cycle. According to the invention, the dynamic adjustment of the timer time interval is completed, time span proportional relations between the timer time interval and a real
system are changed, the adjustable function of the timer is realized, the single rate problem of the timer is resolved, and the application requirements of the Windows program in different environments are met.