private readonly IContentTypeRepository _contentTypeRepository;
        private readonly IContentModelUsage _contentUsageLoader;

        private IEnumerable<ContentUsage> GetBlockReferencesByType<T>() where T : BlockData
        {
            var contentType = _contentTypeRepository.Load<T>();
            var usages = _contentUsageLoader.ListContentOfContentType(contentType).ToList();
            return usages;
        }

Beware the performance implications as this isn't a common use case for run-time it doesn't come with built-in performance optimization.

This is basically a function for editors, so yes, it's not performance optimized (would be quite difficult as well). So make sure you don't use this on an end-user faced feature. 

Oh I wanna find a block is used how many times, not how many instances are there a Block Type has.
But I found the solution for my question.

var contentRepository = ServiceLocator.Current.GetInstance<IContentRepository>();
var timesIsUsed = contentRepository.GetReferencesToContent(block.ContentLink, false);

Thanks for your answer :D