I am doing an application where I extract the google reviews using google places API.When I read the document related to it in "https://developers.google.com/maps/documentation/javascript/places",I found out that I could get only 5 top reviews.Is there any option to get more reviews.
There is a feature request for that: Issue 7630: Response to Include More Than 5 Reviews ─ I'd recommend you "star" it to receive updates.
In order to have access to more than 5 reviews with the Google API you have to purchase Premium data Access from Google. That premium plan will grant you access to all sorts of additional data points you have to shell out a pretty penny.
If you are a Business owner wanting to retrieve all of your reviews, you can do so but first you have to get verified and could do this through the MyBusiness API more info here: https://developers.google.com/my-business/
Adding to the answer of @miguev, there's at the moment no way to get more than 5 top reviews without using premium APIs (according to a Google Maps guy I had a talk with) and that's pricey.
来源：https://stackoverflow.com/questions/39223719/to-get-more-than-5-reviews-from-google-places-api